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Lightning Protection #35279
03/07/04 01:09 AM
03/07/04 01:09 AM
R
RJD  Offline OP
Junior Member
Joined: Mar 2004
Posts: 1
canada
Hello, at work we have a steel structure. There are two poes on either side of the structure with an array of conductors above the structure. The array is attached to a four electrode grid. The stucture is bonded to this grid.I have been tasked to do periodic maintenance on this protection. Any of you out there do ths before? Any suggestions on what to do and of any special equipment I may need to procure.Thanks in advance!

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Re: Lightning Protection #35280
03/07/04 03:41 PM
03/07/04 03:41 PM
B
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
There may be a Canadian equivalent to NFPA standard 780-2000 that is used below the 49th parallel. It is not ‘breezy’ reading, but carries a lot of weight. Using such a document as the basis for review of an existing installation “do’s and don’ts” may be worthwhile.

Periodic ground-resistance “fall of potential’ {3-lead} testing is also fairly common in lightning-protection maintenace. With the lightning-protection ground rods forming a grid of larger area, {than, say, a single rod} recommended spacing for test electrodes may be quite large
http://www.aemc.com/techinfo/techworkbooks/ground_resistance_testers/950-WKBK-GROUND.pdf [40 pages ~360KB] http://205.247.219.223/training/catalog/common_viewproduct.asp?product=122 [description only]

The effort and expense generally expended for maintenance of a lightning-protection system has a lot to do with the value of the protected facility. A 17th-century museum or television studio usually gets a lot more attention than a convenience store or hay barn.


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